Abstract
The reflection and transmission of arbitrarily polarized electromagnetic waves that are obliquely incident upon an inhomogeneous material characterized by arbitrary spatial profiles of electric permittivity and magnetic permeability are considered. A scaling length that is large compared with the wavelength is introduced, and second-order Wentzel–Kramers–Brillouin solutions are obtained for the TE and TM waves. The first two terms in the asymptotic expansion of the Fresnel reflection coefficients are given and utilized in a direct calculation of the fields that are reflected at the rims of all spherical and cylindrical inhomogeneous dielectric lenses. Additional applications are made to an inhomogeneous coating layer backed by a metallic plate and to an inhomogeneous slab in free space.
© 1981 Optical Society of America
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